21132161 has 8 divisors (see below), whose sum is σ = 22286880. Its totient is φ = 19981728.

The previous prime is 21132131. The next prime is 21132191. The reversal of 21132161 is 16123112.

It is an interprime number because it is at equal distance from previous prime (21132131) and next prime (21132191).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21132161 - 2¹⁰ = 21131137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21132131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17210 + ... + 18396.

It is an arithmetic number, because the mean of its divisors is an integer number (2785860).

Almost surely, 2^21132161 is an apocalyptic number.

It is an amenable number.

21132161 is a deficient number, since it is larger than the sum of its proper divisors (1154719).

21132161 is a wasteful number, since it uses less digits than its factorization.

21132161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143.

The product of its digits is 72, while the sum is 17.

The square root of 21132161 is about 4596.9730258073. The cubic root of 21132161 is about 276.4699730971.

Adding to 21132161 its reverse (16123112), we get a palindrome (37255273).

The spelling of 21132161 in words is "twenty-one million, one hundred thirty-two thousand, one hundred sixty-one".